What is the trend for atomic radius?

What is the trend for atomic radius?

Periodic Trend The atomic radius of atoms generally decreases from left to right across a period. There are some small exceptions, such as the oxygen radius being slightly greater than the nitrogen radius. Within a period, protons are added to the nucleus as electrons are being added to the same principal energy level.

What are the 2 trends in atomic radius?

There are two main atomic radius trends. One atomic radius trend occurs as you move left to right across the periodic table (moving within a period), and the other trend occurs when you move from the top of the periodic table down (moving within a group).

Why does the atomic radius increase down a Group 2?

Group 2 Elements are called Alkali Earth Metals. They are called s-block elements because their highest energy electrons appear in the s subshell. Progressing down group 2, the atomic radius increases due to the extra shell of electrons for each element. Going down the group, the first ionisation energy decreases.

Why does atomic radius increase down and to the left?

Number of protons increases → nuclear charge increases → atomic size decreases. Number of shells increases → atomic radius increases. The shielding effect increases (since now electrons from previous shells also contribute to the shielding effect) → atomic radius increases.

What decreases going down group 2?

Ionisation energies decrease down the group. This is because each element down group 2 has an extra electron shell, so the outer shell electrons are further away from the nucleus which ultimately means a reduced nuclear attraction (the attraction between the positive nucleus and negative electrons).

Why does atomic radius decrease as you go from left to right across a period?

On the periodic table, atomic radius generally decreases as you move from left to right across a period (due to increasing nuclear charge) and increases as you move down a group (due to the increasing number of electron shells).

Why does atomic radius decrease from left to right?

What is the trend in atomic radius from left to right across a period?

How does atomic radius change as you move across the periodic table?

Since Zeffdecreases going down a group and right to left across the periodic table, the atomic radius will increase going down a group and right to left across the periodic table.

Does strontium have a larger ionic radius than calcium?

Strontium is a row below calcium, meaning it has an additional electron shell. This additional shell means that the outer-shell electrons in strontium are further away from the nucleus in calcium (strontium has a larger atomic radius than calcium).

What are the trends in group 2 elements?

The overall trend, for the reactivity of Group 2 metals with water, is an increase down the group. The outer electrons are easier to remove as they are further from the nucleus and there is more shielding resulting in a lower nuclear attraction.

Why atomic radius decreases across a period and increases down a group?

Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.